US3742973A - Guiding comb tooth for air jet looms - Google Patents

Guiding comb tooth for air jet looms Download PDF

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Publication number
US3742973A
US3742973A US00224418A US3742973DA US3742973A US 3742973 A US3742973 A US 3742973A US 00224418 A US00224418 A US 00224418A US 3742973D A US3742973D A US 3742973DA US 3742973 A US3742973 A US 3742973A
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US
United States
Prior art keywords
tooth
comb tooth
guiding comb
guiding
shed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00224418A
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English (en)
Inventor
K Kakac
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
VYZK D VYVOJOVY USTAV Z VSEOBE
VYZKUMNY D VYVOJOVY USTAV ZAVODU VSEOBECNEKO STROJIRENSTVI CS
Original Assignee
VYZK D VYVOJOVY USTAV Z VSEOBE
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Application filed by VYZK D VYVOJOVY USTAV Z VSEOBE filed Critical VYZK D VYVOJOVY USTAV Z VSEOBE
Application granted granted Critical
Publication of US3742973A publication Critical patent/US3742973A/en
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Expired - Lifetime legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D49/00—Details or constructional features not specially adapted for looms of a particular type
    • D03D49/60—Construction or operation of slay
    • D03D49/62—Reeds mounted on slay
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/27—Drive or guide mechanisms for weft inserting
    • D03D47/277—Guide mechanisms
    • D03D47/278—Guide mechanisms for pneumatic looms

Definitions

  • This invention relates to improvements in a guiding comb tooth for an air jet weaving loom and the object of this invention is to increase the efficiency of such guiding comb and to permit an increase of the picking width of the loom while maintaining a reliable penetration of the guiding comb into the respective system of warp threads without causing defects.
  • Another known comb tooth has straight and arcuate parts with a wedge shaped external circumference in order to facilitate entrance of the comb teeth into the system of warp threads and a correct separation of adjacent warp threads with a minimum friction.
  • Another solution proposed a comb tooth of a small circular shape, covered by a flat spring contacting the open front surface of the tooth.
  • This flat spring completes the circumference of the picking opening of the tooth during the entrance of the comb teeth into the shed, during picking through the weft, and in the course of a major part of the following operation, forming a picking channel, whereby only in the course of removal of the weft thread from this picking channel is the upper part of the flat spring lifted due to the motion of the guiding comb relative to the picked through weft thread.
  • This arrangement has a number of drawbacks, the most serious being that the comb tooth enters the system of warp threads, not by its wedge-shaped part, but by its flat part having the width of the flat spring, so that the separation of the warp threads in the course of entrance of the guiding comb into the shed over the system of warp threads is rather forcible and causes frequent damages and breakage of individual warp threads.
  • Another drawback of this arrangement is the impossibility of providing the part of the picking aperture, formed by said spring, with a frusto-conical wall required for concentrating the air stream in the center of the picking aperture; as a result, the reduction of losses of energy obtained by an uninterrupted circumference of the picking aperture obtained by the sealing by means of said spring is reduced by an increase of stray losses of the air stream.
  • Another substantial drawback of this comb tooth is its complicated manufacture, as it is composed of three major parts: a body with a semicircular opening, a flat spring, and a fastening screw, rivet or the like.
  • the flat spring must not be too stiff; if, however, it is too weak, it becomes easily fatigued and it fails to perform its task of perfectly sealing the exit slot. Fatigue of this spring is caused by its rubbing against warp threads, particularly in the course of movement of the guiding comb in the direction of the impact by the reed.
  • the arcuate part of the comb tooth is provided at a place in front of the exit slot from the picking aperture with flat spring means which can be easily deformed and one end of which completely closes the exit slot from the picking aperture.
  • This flat spring means has advantageously in the extreme position of the comb tooth within the shed an inclination, corresponding to the inclination of the upper system of warp threads forming the shed, whereby the maximum width of said spring means does not surpass the maximum width of the tooth body.
  • the individual teeth are preferably made of one piece of plastic by injection molding.
  • FIG. 1 is a view in elevation of a comb tooth disposed in a fully opened shed that is in the picking through position;
  • FIG. 2 is a view of a comb in section, the section being taken along a plane indicated in FIG. 1 by the line A-A;
  • FIG. 3 is a view of a comb in section, the section being taken along a plane indicated in FIG. I by the line 8-8;
  • FIG. 4 is an elevation ofa comb in a closing shed and in the first phase of removal of the picked through weft from the picking aperture.
  • the body of the comb tooth 1 shown has a body with a stem 2, the body forking in its upper part into a first, straight part 3 and a second, arcuate part 4.
  • the stem 2 of the tooth 1 is fixed in a commonly known manner on a batten (not shown).
  • the top of the straight part 3 of the tooth 1 passes over into a tip 5, whereas the top of the arcuate part 4 of the tooth 1 forms an exit slot 6 and is provided with flat spring means 7 which in FIG. 1 fully contacts the longitudinally straight, transversely tipped internal surface 8 of the straight part 3 of the tooth 1.
  • the packing aperture 9 has nearly the shape of a full circle.
  • the internal surfaces 9 forming the picking aperture are frusto-conical and disposed at an angle 01/2 with respect to the plane of the tooth in order to concentrate the air stream passing in the direction of the arrow S (FIG. 2) to the center of the picking aperture.
  • the frustum formed by the surfaces 9 has an apex angle a and is disposed symmetrically with respect to the broad plate of the tooth.
  • all external circumferences of the tooth 1, including the straight part 3 and the arcuate part 4 of the tooth, are shaped as a wedge symmetrical with respect to the mid plane of the broad extent of the tooth, in order to penetrate easily into the shed.
  • FIG. 1 also shows the upper system 10 of warp threads, the lower system 11 of warp threads, and the just picked through weft 12. Furthermore, FIG. 1 shows that the broad extent of flat spring means 7 is substantially parallel with the upper system 10 of warp threads at the time when both systems 10 and 11 of warp threads form a fully open shed.
  • FIG. 4 shows a tooth 1 and both systems 10 and 11 of warp threads at the moment when the shed is closing and the tooth 1, due to turning of the batten (not shown) upon which it is mounted starts to leave the shed while due to a relative movement of the tooth l with respect to the weft thread 12 the flat spring means 7 is deformed in the direction toward the exit slot 6, thereby enabling the removal of the weft thread 12 from the previously closed picking aperture 9.
  • the weft thread 12 is removed in a known way from the exit slot 6, the flat spring means 7 then returning to its original position, where it is in contact with the straight internal surface 8 of the straight part 3 of the tooth l.
  • the tooth 1 is advantageously made of one piece of elastic plastic material, preferably by injection molding in a known mold (not shown) where an exact shape and the required smooth surfaces of the tooth are obtained without any further machining.
  • the described tooth operates as follows: Let us consider the position of the comb tooth 1 in the open shed formed by the upper system 10 of warp threads and by the lower system 11 of warp threads as shown in FIG. 1.
  • the batten (not shown), is in its extreme rear (right, FIG. 1) position, where the picking through of the weft 12 may proceed by the known stream of pressure air.
  • the continuity of the picking aperture 9 is completed by the flat spring means 7, closing on the longitudinally straight, tipped internal surface 8 of the straight part 3 of the tooth 1.
  • the batten After the picking through of the weft thread 12 is finished, the batten starts to move to its beating-up position in the direction of the arrow S as indicated in FIGS. 1 and 4, whereby the shed starts to close by approaching both the upper and lower system 10 and 11 of warp threads; simultaneously, the guiding comb with the teeth 1 starts to leave the shed as the teeth 1 pass through the lower system 10 of warp threads in the direction S,.
  • the weft thread 12 reaches a position indicated in FIG. 4, wherein the weft thread 12 bends the flat spring means 7 upwards toward the exit slot 6, whereby the free end of the flat spring means 7 is separated from the straight internal surface 8 of the straight part 3 of the tooth 1, thus enabling the weft thread 12 to leave the picking aperture 9, the circumference of which, up to now, has been complete.
  • the flat spring means 7 because of its own elasticity, again comes into contact with the straight internal surface 8 of the straight part 3 of the tooth l, and thus again fully closes the circumference of the picking aperture 9 so that the time interval within which pressure air is allowed to escape from the picking aperture 9 is reduced to a minimum.
  • the weft thread 12 is removed in a known way through the exit slot 6 of the tooth 1 and this tooth leaves (in a manner not shown) the closing weft.
  • the picked through weft thread 12 is thereafter beaten up by a reed (not shown) followed by a repeated penetrationof the individual teeth 1 of the guiding comb into the again open shed; in the course of this movement the teeth 1 enter the lower system 11 of warp threads by their pointed straight part 3 or by its tip 5.
  • the penetration of the lower system 11 of warp threads is accomplished with a minimum of friction and stressing of the warp threads with which the individual teeth 1 come in contact.
  • a guiding comb tooth for air jet looms said tooth being adapted to guide a weft thread picked by a stream of pressure air through the open shed of a loom, the shed being formed by an upper system of warp threads and a lower system of warp threads, said guiding comb being adapted to be mounted in said loom in a position determined by a first extreme position beyond the shed, and by a second extreme position within an open shed, said guiding comb comprising a body forking into a substantially straight part and an arcuate guiding comb tooth and thus, when undeformed, closing completely the exit slot of the picking aperture.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US00224418A 1972-02-08 1972-02-08 Guiding comb tooth for air jet looms Expired - Lifetime US3742973A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US22441872A 1972-02-08 1972-02-08

Publications (1)

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US3742973A true US3742973A (en) 1973-07-03

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US00224418A Expired - Lifetime US3742973A (en) 1972-02-08 1972-02-08 Guiding comb tooth for air jet looms

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US (1) US3742973A (enrdf_load_html_response)
CH (1) CH547368A (enrdf_load_html_response)
DE (1) DE2165800C3 (enrdf_load_html_response)
FR (1) FR2171931B1 (enrdf_load_html_response)
GB (1) GB1373464A (enrdf_load_html_response)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4085777A (en) * 1973-07-24 1978-04-25 Vyzkumny A Vyvojovy Ustav Zavodu Vseobecneho Strojirenstvi Arrangement for the control of weft introduced into looms
DE2750552A1 (de) * 1976-11-12 1978-05-18 Nissan Motor Kammzahn fuer einen luftstrahlwebstuhl
US4117870A (en) * 1976-03-04 1978-10-03 Nissan Motor Company, Limited Weft yarn sensor
US4127149A (en) * 1976-07-14 1978-11-28 Nissan Motor Company, Limited Weft yarn guide
EP0053216A1 (de) * 1980-11-28 1982-06-09 GebràœDer Sulzer Aktiengesellschaft Hilfsblasdüse für eine Luftstrahlwebmaschine
US4386632A (en) * 1979-07-19 1983-06-07 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Weft guiding comb for a jet loom
WO1983002965A1 (en) * 1982-02-19 1983-09-01 Griffith, John, Dalton Weft yarn insertion channel
US4438790A (en) * 1980-03-27 1984-03-27 Ruti Machinery Works Ltd. Apparatus for guiding a fluid medium driven weft thread in the shed of a loom and use of the apparatus at a multiple longitudinal traversing shed loom
US4440198A (en) * 1979-03-17 1984-04-03 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Apparatus for guiding weft yarns in a jet loom
US4907627A (en) * 1988-10-27 1990-03-13 Picanol Nv Weft guide and shed retainer for a fluid jet loom

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5927411B2 (ja) * 1978-02-27 1984-07-05 株式会社豊田中央研究所 ジエツトル−ムにおける緯入れ装置
DE3067583D1 (en) * 1980-12-02 1984-05-24 Sulzer Ag Guiding blade for forming the guiding channel of a loom
EP0196349B1 (de) * 1985-04-02 1990-01-03 GebràœDer Sulzer Aktiengesellschaft Webrotor für Reihenfachwebmaschinen

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4085777A (en) * 1973-07-24 1978-04-25 Vyzkumny A Vyvojovy Ustav Zavodu Vseobecneho Strojirenstvi Arrangement for the control of weft introduced into looms
US4117870A (en) * 1976-03-04 1978-10-03 Nissan Motor Company, Limited Weft yarn sensor
US4127149A (en) * 1976-07-14 1978-11-28 Nissan Motor Company, Limited Weft yarn guide
DE2750552A1 (de) * 1976-11-12 1978-05-18 Nissan Motor Kammzahn fuer einen luftstrahlwebstuhl
FR2370811A1 (fr) * 1976-11-12 1978-06-09 Nissan Motor Aiguille de peigne de guidage d'air pour un metier a tisser a jet d'air
US4136716A (en) * 1976-11-12 1979-01-30 Nissan Motor Company, Limited Air guiding comb tooth for air jet weaving loom
US4440198A (en) * 1979-03-17 1984-04-03 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Apparatus for guiding weft yarns in a jet loom
US4386632A (en) * 1979-07-19 1983-06-07 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Weft guiding comb for a jet loom
US4438790A (en) * 1980-03-27 1984-03-27 Ruti Machinery Works Ltd. Apparatus for guiding a fluid medium driven weft thread in the shed of a loom and use of the apparatus at a multiple longitudinal traversing shed loom
EP0053216A1 (de) * 1980-11-28 1982-06-09 GebràœDer Sulzer Aktiengesellschaft Hilfsblasdüse für eine Luftstrahlwebmaschine
WO1983002965A1 (en) * 1982-02-19 1983-09-01 Griffith, John, Dalton Weft yarn insertion channel
US4907627A (en) * 1988-10-27 1990-03-13 Picanol Nv Weft guide and shed retainer for a fluid jet loom

Also Published As

Publication number Publication date
FR2171931A1 (enrdf_load_html_response) 1973-09-28
GB1373464A (en) 1974-11-13
DE2165800B2 (enrdf_load_html_response) 1973-10-11
DE2165800C3 (de) 1974-05-16
DE2165800A1 (de) 1973-07-12
CH547368A (de) 1974-03-29
FR2171931B1 (enrdf_load_html_response) 1974-12-13

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